Which turbo?
Which turbo? Hey guys I have a 99 C5 with an iron block forged 370 roughly 9.5 to 1 CR. Im using stock 317 heads and I have a custom grind 228/228 .588 .588 114lsa cam. Im a TR6060 6 speed(09 ZR1 tranny=longer gears) and 342's in the back. I plan on reving to 7000-7200. I am building a single turbo setup. My goals for now are as much boost as I can run on 91 octane. I'd really like to get over 700whp if possible. The more the marrier! In the future I'll be switching to e85 and shooting for the moon.
My builder is Precision dealer and wants to use them. My question is which turbo? This is a street car and its taken to the track. I do more "side-by-side acceleration testing" on the street tho... : )
I was looking at te pT7675 or the PT88. Trying to not spend a ton on the turbo really... just want something that will work good.
What do you guys think? Any dynos that people can post would be great!
Thanks!
My builder is Precision dealer and wants to use them. My question is which turbo? This is a street car and its taken to the track. I do more "side-by-side acceleration testing" on the street tho... : )
I was looking at te pT7675 or the PT88. Trying to not spend a ton on the turbo really... just want something that will work good.
What do you guys think? Any dynos that people can post would be great!
Thanks!
Both turbos you mentioned will get you the 700 rw goal. Either one would be a good pick in my opinion. You would get more power out of the pt 88 obviously but will not spool as fast as the 76.
My dyno numbers and times are below on a PT7875 (same as a 7675 basically). Seeing that you are a stick and are only looking for 700rwhp, I'd go that route. The PT88 uses a much larger and heavier turbine wheel which will spool much slower. The 7675 will make over 850rwhp through a stick with 370 cubes without issue.
A 7675 isn't going to do 1000rwhp on E85 on a 370. The PT88 will definitely get you close as the cost of some spool time. You may want to look into some of the budget Garrett units as well.
You could go with a Garret GTS76 with the 94mm turbine and Precision .96 a/r t4 housing. that way you can just swap in the cartage and compressor to the turbine housing when you want to go bigger down the road. My buddy has this setup on a stock short block 6l with hand ported heads. It's in a 4900lbs 4x4 truck that runs mid 10's at about 130 
You could go with a Garret GTS76 with the 94mm turbine and Precision .96 a/r t4 housing. that way you can just swap in the cartage and compressor to the turbine housing when you want to go bigger down the road. My buddy has this setup on a stock short block 6l with hand ported heads. It's in a 4900lbs 4x4 truck that runs mid 10's at about 130
I saw that somebody said there PT88 hit full boost at 4300-4500. Does anybody have any experience with either turbo? What RPM's are you hitting full boost at? Any dyno graphs?
Trending Topics
Yea the reason I am strictly using Precision is because my Turbo kit Fabricator(Brad at AFI) sells Precisions only so he gets a huge discount. I just want to make the most power on pump gas. I figured the PT88 would give me a decent amount more with the same amount of boost from the PT7675. Does that make sense?
I saw that somebody said there PT88 hit full boost at 4300-4500. Does anybody have any experience with either turbo? What RPM's are you hitting full boost at? Any dyno graphs?
I saw that somebody said there PT88 hit full boost at 4300-4500. Does anybody have any experience with either turbo? What RPM's are you hitting full boost at? Any dyno graphs?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo I kinda figured I would be in a great power band most of the time. I will be using boost by gear. And I have a 2-step for launching.
I have seen people making 750whp on 14-15 psi and pump gas with the PT88... Thats nutz! Id love to acheive that!
